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The ICP reads the oil pressure in your HPOP oil system, sending the pressure readings to the PCM, which adjusts the Pressure in the HPO system. (For your Oil Fired Injecors. )
To test to see if its a bad ICP, just disconnect the plug and drive it... if the symptoms go away.... Bad ICP.
Have you tried International since it is the T444E engine or Tousley Ford?
Old one that came with F350 was leak oil
One come from 1998 International in junkyard it 7.3L I look icp it clean no oil so I thought it will work so i swap and haven't notice difference and keep get P1280.